The Department of Defense, through the Defense Logistics Agency (DLA) Aviation at Philadelphia, PA, is seeking qualified sources for the procurement of a Gearbox Assembly, AI, identified by NSN 7R-1680-015554507-H1, with a quantity of 2 each. This procurement requires engineering source approval from the design control activity to ensure the quality of the part, as it is flight critical and the technical data available does not support full and open competition. Interested vendors must provide necessary documentation for source approval, as only previously approved sources will be considered for award, and offers lacking required data will be disqualified. For further inquiries, interested parties can contact Jillian M. O'Connor at (215) 737-0550 or via email at jillian.oconnor@dla.mil.